mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
gpio: thunderx: Switch to GPIOLIB_IRQCHIP
Use the new infrastructure for hierarchical irqchips in gpiolib. The major part of the rewrite was dues to the fact that the driver was passing around a per-irq pointer to struct thunderx_line * data container, and the central handlers will assume struct gpio_chip * to be passed to we need to use the hwirq as index to look up the struct thunderx_line * for each IRQ. The pushing and pop:ing of the irqdomain was confusing because I've never seen this before, but I tried to replicate it as best I could. I have no chance to test or debug this so I need help. Cc: David Daney <david.daney@cavium.com> Cc: Thierry Reding <treding@nvidia.com> Cc: Brian Masney <masneyb@onstation.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20190808123242.5359-4-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij
parent
821c76c4c3
commit
a7fc89f9d5
2 changed files with 56 additions and 106 deletions
|
|
@ -539,6 +539,7 @@ config GPIO_THUNDERX
|
|||
tristate "Cavium ThunderX/OCTEON-TX GPIO"
|
||||
depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
|
||||
depends on PCI_MSI
|
||||
select GPIOLIB_IRQCHIP
|
||||
select IRQ_DOMAIN_HIERARCHY
|
||||
select IRQ_FASTEOI_HIERARCHY_HANDLERS
|
||||
help
|
||||
|
|
|
|||
|
|
@ -53,7 +53,6 @@ struct thunderx_line {
|
|||
struct thunderx_gpio {
|
||||
struct gpio_chip chip;
|
||||
u8 __iomem *register_base;
|
||||
struct irq_domain *irqd;
|
||||
struct msix_entry *msix_entries; /* per line MSI-X */
|
||||
struct thunderx_line *line_entries; /* per line irq info */
|
||||
raw_spinlock_t lock;
|
||||
|
|
@ -283,54 +282,60 @@ static void thunderx_gpio_set_multiple(struct gpio_chip *chip,
|
|||
}
|
||||
}
|
||||
|
||||
static void thunderx_gpio_irq_ack(struct irq_data *data)
|
||||
static void thunderx_gpio_irq_ack(struct irq_data *d)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
|
||||
writeq(GPIO_INTR_INTR,
|
||||
txline->txgpio->register_base + intr_reg(txline->line));
|
||||
txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
|
||||
}
|
||||
|
||||
static void thunderx_gpio_irq_mask(struct irq_data *data)
|
||||
static void thunderx_gpio_irq_mask(struct irq_data *d)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
|
||||
writeq(GPIO_INTR_ENA_W1C,
|
||||
txline->txgpio->register_base + intr_reg(txline->line));
|
||||
txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
|
||||
}
|
||||
|
||||
static void thunderx_gpio_irq_mask_ack(struct irq_data *data)
|
||||
static void thunderx_gpio_irq_mask_ack(struct irq_data *d)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
|
||||
writeq(GPIO_INTR_ENA_W1C | GPIO_INTR_INTR,
|
||||
txline->txgpio->register_base + intr_reg(txline->line));
|
||||
txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
|
||||
}
|
||||
|
||||
static void thunderx_gpio_irq_unmask(struct irq_data *data)
|
||||
static void thunderx_gpio_irq_unmask(struct irq_data *d)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
|
||||
writeq(GPIO_INTR_ENA_W1S,
|
||||
txline->txgpio->register_base + intr_reg(txline->line));
|
||||
txgpio->register_base + intr_reg(irqd_to_hwirq(d)));
|
||||
}
|
||||
|
||||
static int thunderx_gpio_irq_set_type(struct irq_data *data,
|
||||
static int thunderx_gpio_irq_set_type(struct irq_data *d,
|
||||
unsigned int flow_type)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct thunderx_gpio *txgpio = txline->txgpio;
|
||||
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
struct thunderx_line *txline =
|
||||
&txgpio->line_entries[irqd_to_hwirq(d)];
|
||||
u64 bit_cfg;
|
||||
|
||||
irqd_set_trigger_type(data, flow_type);
|
||||
irqd_set_trigger_type(d, flow_type);
|
||||
|
||||
bit_cfg = txline->fil_bits | GPIO_BIT_CFG_INT_EN;
|
||||
|
||||
if (flow_type & IRQ_TYPE_EDGE_BOTH) {
|
||||
irq_set_handler_locked(data, handle_fasteoi_ack_irq);
|
||||
irq_set_handler_locked(d, handle_fasteoi_ack_irq);
|
||||
bit_cfg |= GPIO_BIT_CFG_INT_TYPE;
|
||||
} else {
|
||||
irq_set_handler_locked(data, handle_fasteoi_mask_irq);
|
||||
irq_set_handler_locked(d, handle_fasteoi_mask_irq);
|
||||
}
|
||||
|
||||
raw_spin_lock(&txgpio->lock);
|
||||
|
|
@ -359,33 +364,6 @@ static void thunderx_gpio_irq_disable(struct irq_data *data)
|
|||
irq_chip_disable_parent(data);
|
||||
}
|
||||
|
||||
static int thunderx_gpio_irq_request_resources(struct irq_data *data)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct thunderx_gpio *txgpio = txline->txgpio;
|
||||
int r;
|
||||
|
||||
r = gpiochip_lock_as_irq(&txgpio->chip, txline->line);
|
||||
if (r)
|
||||
return r;
|
||||
|
||||
r = irq_chip_request_resources_parent(data);
|
||||
if (r)
|
||||
gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static void thunderx_gpio_irq_release_resources(struct irq_data *data)
|
||||
{
|
||||
struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
|
||||
struct thunderx_gpio *txgpio = txline->txgpio;
|
||||
|
||||
irq_chip_release_resources_parent(data);
|
||||
|
||||
gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
|
||||
}
|
||||
|
||||
/*
|
||||
* Interrupts are chained from underlying MSI-X vectors. We have
|
||||
* these irq_chip functions to be able to handle level triggering
|
||||
|
|
@ -402,50 +380,24 @@ static struct irq_chip thunderx_gpio_irq_chip = {
|
|||
.irq_unmask = thunderx_gpio_irq_unmask,
|
||||
.irq_eoi = irq_chip_eoi_parent,
|
||||
.irq_set_affinity = irq_chip_set_affinity_parent,
|
||||
.irq_request_resources = thunderx_gpio_irq_request_resources,
|
||||
.irq_release_resources = thunderx_gpio_irq_release_resources,
|
||||
.irq_set_type = thunderx_gpio_irq_set_type,
|
||||
|
||||
.flags = IRQCHIP_SET_TYPE_MASKED
|
||||
};
|
||||
|
||||
static int thunderx_gpio_irq_translate(struct irq_domain *d,
|
||||
struct irq_fwspec *fwspec,
|
||||
irq_hw_number_t *hwirq,
|
||||
unsigned int *type)
|
||||
static int thunderx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
|
||||
unsigned int child,
|
||||
unsigned int child_type,
|
||||
unsigned int *parent,
|
||||
unsigned int *parent_type)
|
||||
{
|
||||
struct thunderx_gpio *txgpio = d->host_data;
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(gc);
|
||||
|
||||
if (WARN_ON(fwspec->param_count < 2))
|
||||
return -EINVAL;
|
||||
if (fwspec->param[0] >= txgpio->chip.ngpio)
|
||||
return -EINVAL;
|
||||
*hwirq = fwspec->param[0];
|
||||
*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
|
||||
*parent = txgpio->base_msi + (2 * child);
|
||||
*parent_type = IRQ_TYPE_LEVEL_HIGH;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int thunderx_gpio_irq_alloc(struct irq_domain *d, unsigned int virq,
|
||||
unsigned int nr_irqs, void *arg)
|
||||
{
|
||||
struct thunderx_line *txline = arg;
|
||||
|
||||
return irq_domain_set_hwirq_and_chip(d, virq, txline->line,
|
||||
&thunderx_gpio_irq_chip, txline);
|
||||
}
|
||||
|
||||
static const struct irq_domain_ops thunderx_gpio_irqd_ops = {
|
||||
.alloc = thunderx_gpio_irq_alloc,
|
||||
.translate = thunderx_gpio_irq_translate
|
||||
};
|
||||
|
||||
static int thunderx_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
|
||||
{
|
||||
struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
|
||||
|
||||
return irq_find_mapping(txgpio->irqd, offset);
|
||||
}
|
||||
|
||||
static int thunderx_gpio_probe(struct pci_dev *pdev,
|
||||
const struct pci_device_id *id)
|
||||
{
|
||||
|
|
@ -453,6 +405,7 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
|
|||
struct device *dev = &pdev->dev;
|
||||
struct thunderx_gpio *txgpio;
|
||||
struct gpio_chip *chip;
|
||||
struct gpio_irq_chip *girq;
|
||||
int ngpio, i;
|
||||
int err = 0;
|
||||
|
||||
|
|
@ -497,8 +450,8 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
|
|||
}
|
||||
|
||||
txgpio->msix_entries = devm_kcalloc(dev,
|
||||
ngpio, sizeof(struct msix_entry),
|
||||
GFP_KERNEL);
|
||||
ngpio, sizeof(struct msix_entry),
|
||||
GFP_KERNEL);
|
||||
if (!txgpio->msix_entries) {
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
|
|
@ -539,27 +492,6 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
|
|||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* Push GPIO specific irqdomain on hierarchy created as a side
|
||||
* effect of the pci_enable_msix()
|
||||
*/
|
||||
txgpio->irqd = irq_domain_create_hierarchy(irq_get_irq_data(txgpio->msix_entries[0].vector)->domain,
|
||||
0, 0, of_node_to_fwnode(dev->of_node),
|
||||
&thunderx_gpio_irqd_ops, txgpio);
|
||||
if (!txgpio->irqd) {
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Push on irq_data and the domain for each line. */
|
||||
for (i = 0; i < ngpio; i++) {
|
||||
err = irq_domain_push_irq(txgpio->irqd,
|
||||
txgpio->msix_entries[i].vector,
|
||||
&txgpio->line_entries[i]);
|
||||
if (err < 0)
|
||||
dev_err(dev, "irq_domain_push_irq: %d\n", err);
|
||||
}
|
||||
|
||||
chip->label = KBUILD_MODNAME;
|
||||
chip->parent = dev;
|
||||
chip->owner = THIS_MODULE;
|
||||
|
|
@ -574,11 +506,28 @@ static int thunderx_gpio_probe(struct pci_dev *pdev,
|
|||
chip->set = thunderx_gpio_set;
|
||||
chip->set_multiple = thunderx_gpio_set_multiple;
|
||||
chip->set_config = thunderx_gpio_set_config;
|
||||
chip->to_irq = thunderx_gpio_to_irq;
|
||||
girq = &chip->irq;
|
||||
girq->chip = &thunderx_gpio_irq_chip;
|
||||
girq->fwnode = of_node_to_fwnode(dev->of_node);
|
||||
girq->parent_domain =
|
||||
irq_get_irq_data(txgpio->msix_entries[0].vector)->domain;
|
||||
girq->child_to_parent_hwirq = thunderx_gpio_child_to_parent_hwirq;
|
||||
girq->handler = handle_bad_irq;
|
||||
girq->default_type = IRQ_TYPE_NONE;
|
||||
|
||||
err = devm_gpiochip_add_data(dev, chip, txgpio);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
/* Push on irq_data and the domain for each line. */
|
||||
for (i = 0; i < ngpio; i++) {
|
||||
err = irq_domain_push_irq(chip->irq.domain,
|
||||
txgpio->msix_entries[i].vector,
|
||||
chip);
|
||||
if (err < 0)
|
||||
dev_err(dev, "irq_domain_push_irq: %d\n", err);
|
||||
}
|
||||
|
||||
dev_info(dev, "ThunderX GPIO: %d lines with base %d.\n",
|
||||
ngpio, chip->base);
|
||||
return 0;
|
||||
|
|
@ -593,10 +542,10 @@ static void thunderx_gpio_remove(struct pci_dev *pdev)
|
|||
struct thunderx_gpio *txgpio = pci_get_drvdata(pdev);
|
||||
|
||||
for (i = 0; i < txgpio->chip.ngpio; i++)
|
||||
irq_domain_pop_irq(txgpio->irqd,
|
||||
irq_domain_pop_irq(txgpio->chip.irq.domain,
|
||||
txgpio->msix_entries[i].vector);
|
||||
|
||||
irq_domain_remove(txgpio->irqd);
|
||||
irq_domain_remove(txgpio->chip.irq.domain);
|
||||
|
||||
pci_set_drvdata(pdev, NULL);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue